Himax Technologies has filed a patent for an optical film that includes a film body with randomly distributed micro-structures. These micro-structures correspond to different regions, each defined by a specific number of auxiliary micro-structures surrounding a main micro-structure. The patent claims that the ratio of the smallest region’s area to the largest region’s area is greater than 50% and less than 100%. GlobalData’s report on Himax Technologies gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Himax Technologies, Adaptive video coding was a key innovation area identified from patents. Himax Technologies's grant share as of September 2023 was 69%. Grant share is based on the ratio of number of grants to total number of patents.

Optical film with randomly distributed micro-structures of varying sizes

Source: United States Patent and Trademark Office (USPTO). Credit: Himax Technologies Inc

A recently filed patent (Publication Number: US20230314673A1) describes an optical film that has a film body with randomly distributed micro-structures. These micro-structures correspond to different regions on the film body, with each region defined by a main micro-structure surrounded by a specific number of auxiliary micro-structures. The patent claims that the ratio of the area of the smallest region to the area of the largest region is greater than 50% and less than 100%.

The optical film also has an average area density, which is the ratio of the sum area of the micro-structures to the area of the film body. The patent claims that the average area density is less than 75% but greater than 30%. This indicates that the film has a significant number of micro-structures distributed across its surface, but they do not cover the entire film body.

The micro-structures in the optical film have specific characteristics. Each auxiliary micro-structure has a portion within the defined regions and a portion outside of them. The main micro-structure is entirely within the regions. The regions themselves are polygonal in shape, with multiple corners located at the centers of the auxiliary micro-structures. These regions can have different shapes, and each region is a quadrilateral.

The dimensions of the micro-structures in the optical film range from 10 micrometers to 50 micrometers, and their aspect ratio ranges from 0.12 to 1. The micro-structures can be either protrusions on the film body's top surface or recesses within the film body.

The optical film has specific transmittance properties. It has a zero-order transmittance of less than 30% and a 5-degree angle range transmittance of less than 50%. In particular, the patent claims that the zero-order transmittance is less than 15%, and the 5-degree angle range transmittance is less than 35%. Additionally, the film has a 10-degree angle range transmittance of less than 50%.

The patent also describes a display device that incorporates the optical film. The device includes a first display, and the optical film is placed on the light output surface of this display. In some embodiments, the device may also include a second display, with the optical film positioned between the two displays.

In summary, the patent describes an optical film with randomly distributed micro-structures that form different regions on the film body. The film has specific transmittance properties and can be used in display devices.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.